Multiple addons using the same name (OS X)
To see what Blender thinks, you need to run Blender from command line.


Open Terminal application
Write cd then hit spacebar and drag&amp;drop your folder with Blender into Terminal window
Enter
In Terminal window write ./blender.app/Contents/MacOS/blender
Enter


Then if you open Blender's "User Preferences" tab "Add-ons", Terminal displays all conflict add-ons.

(There is also patch to show these add ons directly in User Preferences window https://developer.blender.org/D791 for better future)